HP 250 G3 mb: ZS050 LA-A994P Rev:2.0 włacza się brak obrazu

Laptop włącza się brak obrazu na matrycy i na zewnętrznym
Caps Lock nie mruga.
Jak nacisnę przycisk power to laptop się wyłącza.

Pomiary do masy (napięcie na włączonym)
PL102 - 3.1V - Ω bardzo wysoka
PL1002 - 1V - 260Ω
PLG1 - 0,9V - 18Ω
PLZ2 - 1V - 18Ω
PLM2 - 1,4V - 2kΩ
PL303 - 3,5V - 4kΩ
PL302 - 5,2V - 36kΩ

Does it work on an external monitor?
Measure the voltages on pins 1, 3, 4, 23, 24, 28, 32, 38 of JLVDS1.

Zacznij od przeprogramowania pamięci BIOS. post142202.html#p142202

Machine написав:Does it work on an external monitor?

Nie

Machine написав:Measure the voltages on pins 1, 3, 4, 23, 24, 28, 32, 38 of JLVDS1.

1-0V
3-3,4V
4-3,4V
23-0V
24-2,5V
28-19,5V
32-3,4V
38-0V

adam4333 написав:Zacznij od przeprogramowania pamięci BIOS. post142202.html#p142202

Nie mam programatora do KBC

john47 написав:

adam4333 написав:Zacznij od przeprogramowania pamięci BIOS. post142202.html#p142202

Nie mam programatora do KBC

Why do you need a KBC chip programmer, to reflash the BIOS?

Perform the following measurements without battery connected:
- Measure the power consumption (in mA) of the board before pressing to the power button (machine turned off).
- Measure the power consumption (in mA) of the board after pressing to the power button (machine turned on) with and without RAM memory connected.

Check, if the power consumption changes after reflashing the BIOS chip.

matic написав:- Measure the power consumption (in mA) of the board before pressing to the power button (machine turned off).

0,009A przez 5 sekund potem 0A

matic написав:- Measure the power consumption (in mA) of the board after pressing to the power button (machine turned on) with and without RAM memory connected.

z Ram 0,228A
bez Ram 0,192A

matic написав:Check, if the power consumption changes after reflashing the BIOS chip.

Bez zmian

Measure the voltages to ground on both pins of highlighted resistor (picture below), when the machine is turned on.

matic написав:Measure the voltages to ground on both pins of highlighted resistor (picture below), when the machine is turned on.

Na obu 3.4V

Measure the voltages to ground on pin 4 of chips U53, U55, U58, U59 when the machine is turned on.

matic написав:Measure the voltages to ground on pin 4 of chips U53, U55, U58, U59 when the machine is turned on.

U53
2-1,8V
4-3,4V
5-1,8V

U55
2-3,3VV
4-1,3V
5-3,4V

U58
2-0V
4-0V
5-3,3V

U59
2-3,3V
4-1,8V
5-3,3V

- Measure the resistance to ground on pin 2 of chip U58.

If the resistance is high (in kΩ range or greater), measure the following voltages to ground, when the machine is turned on:
- On coils PL1502, PLH2.
- On pin 1 of transistor UF1.
- On pin 4 of chips U54, U57, PU1801.
- On pins 8, 14 of chips U17, U18.

PL1502 - 1,5V
PLH2 - 1V
UF1 - 1. - 1V
U54 - 4. - 3,4V
U57 - 4. - 3,4V
PU1801 - 4. - 1,8V
U17 - 8. - 1,8V
14. - 1,35V
U18 - 8. - 5,2V
14. - 3,4V

The SoC processor is probably damaged and needs to be replaced.
You can try to reflow it, but it's usually only a temporary solution.

matic написав:The SoC processor is probably damaged and needs to be replaced.
You can try to reflow it, but it's usually only a temporary solution.

ok, dziękuję za poświęcony czas.